| 11. | The ginkgo tree is what scientists call a living fossil.
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| 12. | "It really is a living fossil, " said Barbara Briggs, the institution's scientific director.
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| 13. | Moreover, the echidna, often described as a living fossil, has hind feet that face backward.
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| 14. | Some living fossils are taxa that were known from fossils before living representatives were discovered.
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| 15. | In several cases, living fossils are species-poor lineages, but this is not always the case.
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| 16. | Because the helodermatids have remained relatively unchanged morphologically, they are occasionally regarded as living fossils.
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| 17. | The plant has existed for over 300 million years and is considered a living fossil.
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| 18. | The most astonishing sequence showed Vampiroteuthis, the living fossil.
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| 19. | It's one of these classic living fossil animals.
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| 20. | In the intervening 325 million years, phreatoicideans have changed little, and are thus considered living fossils.
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